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Currently, this feature flag exists in content. In master CL
https://chromium-review.googlesource.com/c/chromium/src/+/1773872, this
feature flag is utilized in CreateFromDefaultPlatformCurve to decide
whether to use experimental fling curve or existing fling curve, which
lives in ui.

This CL moves the experimental fling animation flag from content to ui.

Bug: 647137
Change-Id: Ia8051ec250ed6c8c8170d41eb3e52b2e32e9ffab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884515Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Daniel Libby <dlibby@microsoft.com>
Commit-Queue: Sarthak Shah <sarsha@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#713230}